diff --git a/src/diffusers/loaders/lora_pipeline.py b/src/diffusers/loaders/lora_pipeline.py
index 28ef8e63b5..81a927bd55 100644
--- a/src/diffusers/loaders/lora_pipeline.py
+++ b/src/diffusers/loaders/lora_pipeline.py
@@ -4859,11 +4859,57 @@ class WanLoraLoaderMixin(LoraBaseMixin):
             transformer: torch.nn.Module,
             state_dict,
     ):
-
-        if not hasattr(transformer, 'vace_blocks'):
-            return state_dict
-
         target_device = transformer.device
+        if hasattr(transformer, 'vace_blocks'):
+            inferred_rank_for_vace = None
+            lora_weights_dtype_for_vace = next(iter(transformer.parameters())).dtype  # Fallback dtype
+
+            for k_lora_any, v_lora_tensor_any in state_dict.items():
+                if k_lora_any.endswith(".lora_A.weight"):
+                    inferred_rank_for_vace = v_lora_tensor_any.shape[0]
+                    lora_weights_dtype_for_vace = v_lora_tensor_any.dtype
+                    break  # Found one, good enough for rank and dtype
+
+            if inferred_rank_for_vace is not None:
+                # Determine if the LoRA format (as potentially modified by I2V expansion) includes bias
+                # This re-checks 'has_bias' based on the *current* state_dict.
+                current_lora_has_bias = any(".lora_B.bias" in k for k in state_dict.keys())
+
+                for i, vace_block_module_in_model in enumerate(transformer.vace_blocks):
+                    # Specifically target proj_out as per the error message
+                    if hasattr(vace_block_module_in_model, 'proj_out') and \
+                            isinstance(vace_block_module_in_model.proj_out, nn.Linear):
+
+                        proj_out_linear_layer_in_model = vace_block_module_in_model.proj_out
+
+                        vace_lora_A_key = f"vace_blocks.{i}.proj_out.lora_A.weight"
+                        vace_lora_B_key = f"vace_blocks.{i}.proj_out.lora_B.weight"
+
+                        if vace_lora_A_key not in state_dict:
+                            state_dict[vace_lora_A_key] = torch.zeros(
+                                (inferred_rank_for_vace, proj_out_linear_layer_in_model.in_features),
+                                device=target_device, dtype=lora_weights_dtype_for_vace
+                            )
+
+                        if vace_lora_B_key not in state_dict:
+                            state_dict[vace_lora_B_key] = torch.zeros(
+                                (proj_out_linear_layer_in_model.out_features, inferred_rank_for_vace),
+                                device=target_device, dtype=lora_weights_dtype_for_vace
+                            )
+
+                        # Use 'current_lora_has_bias' to decide on padding bias for VACE blocks
+                        if current_lora_has_bias and proj_out_linear_layer_in_model.bias is not None:
+                            vace_lora_B_bias_key = f"vace_blocks.{i}.proj_out.lora_B.bias"
+                            if vace_lora_B_bias_key not in state_dict:
+                                state_dict[vace_lora_B_bias_key] = torch.zeros_like(
+                                    proj_out_linear_layer_in_model.bias,  # Shape from model's bias
+                                    device=target_device  # Dtype from model's bias implicitly by zeros_like
+                                )
+
+        print("AFTER 2:", list(state_dict.keys()))
+        return state_dict
+
+
 
         return state_dict
 
@@ -4915,6 +4961,10 @@ class WanLoraLoaderMixin(LoraBaseMixin):
             transformer=getattr(self, self.transformer_name) if not hasattr(self, "transformer") else self.transformer,
             state_dict=state_dict,
         )
+        state_dict = self._maybe_expand_t2v_lora_for_vace(
+            transformer=getattr(self, self.transformer_name) if not hasattr(self, "transformer") else self.transformer,
+            state_dict=state_dict,
+        )
         is_correct_format = all("lora" in key for key in state_dict.keys())
         if not is_correct_format:
             raise ValueError("Invalid LoRA checkpoint.")